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The results of treatment with the four flavonoids 1–4 at 3, 10 or 30 μg/mL on the production of IL-6 in H1N1-infected A549 cells. At 24 h post infection, the level of IL-6 in the supernatants was measured by ELISA. Data are presented as the mean ± SD of three separate experiments. * p < 0.05compared with model.
